Chemical and Physical Sensing with a Reader and Rfid Tags

1. A method of detecting a stimulus comprising detecting an output from a radio frequency device having a circuit and including a sensor portion and a chemiresponsive sensor material, the chemiresponsive sensor material closing the circuit, the sensor portion configured to change a detectable property of the circuitry when the stimulus contacts or interacts with the radio frequency device, wherein the detectable property change alters the output of the radio frequency device.

2. The method of claim 1, wherein the stimulus includes an aldehyde.

3. The method of claim 1, wherein the stimulus includes an ester.

4. The method of claim 1, wherein the stimulus includes an alkyl group.

5. The method of claim 1, wherein the stimulus includes a chemical relevant to occupational safety.

6. The method of claim 1, wherein the stimulus includes a mold.

7. The method of claim 1, wherein the stimulus includes an environmental pollutant.

8. The method of claim 1, wherein the stimulus includes light.

9. The method of claim 1, wherein the stimulus includes a biologically relevant analyte.

10. The method of claim 1, wherein the stimulus includes molecules found in a biologically-relevant sample.

11. The method of claim 1, wherein the sensor material include a sensing material selected from the group consisting of a metal, an organic material, a dielectric material, a semiconductor material, a polymeric material, a biological material, a nanowire, a semiconducting nanoparticle, a nanotube, a nanofiber, a carbon fiber, a carbon particle, carbon paste, or conducting ink, organic electronics materials, doped conjugated polymers, inorganic materials, biological molecule receptors, cells, antibodies, aptamers, nucleic acids, functionalized biological molecules, and combinations thereof.

12. A tag for detecting a stimulus comprising a radio frequency device having a circuit and including a sensor portion and a sensor material, the sensor material closing the circuit, the sensor portion configured to change a detectable property of the circuitry when the radio frequency device contacts or interacts with the stimulus, wherein the detectable property change alters an output of the radio frequency device, wherein the sensor portion includes a circuit, and wherein the sensor portion is configured to activate the circuit or deactivate the circuit when contacted or having interacted with the stimulus.

13. A system for detecting a stimulus comprising a radio frequency device having a circuit and including a sensor portion and a chemiresponsive sensor material, the chemiresponsive sensor material closing the circuit, the sensor portion configured to change a detectable property of the circuitry when the radio frequency device contacts or interacts with the stimulus, wherein the detectable property change alters an output of the radio frequency device, and a detector detecting the output from the radio frequency device.

14. The tag of claim 12, wherein the sensor material include a chemiresponsive sensing material selected from the group consisting of a metal, an organic material, a dielectric material, a semiconductor material, a polymeric material, a biological material, a nanowire, a semiconducting nanoparticle, a nanotube, a nanofiber, a carbon fiber, a carbon particle, carbon paste, or conducting ink, organic electronics materials, doped conjugated polymers, inorganic materials, biological molecule receptors, cells, antibodies, aptamers, nucleic acids, functionalized biological molecules, and combinations thereof.

15. The system of claim 13, wherein the sensor material include a sensing material selected from the group consisting of a metal, an organic material, a dielectric material, a semiconductor material, a polymeric material, a biological material, a nanowire, a semiconducting nanoparticle, a nanotube, a nanofiber, a carbon fiber, a carbon particle, carbon paste, or conducting ink, organic electronics materials, doped conjugated polymers, inorganic materials, biological molecule receptors, cells, antibodies, aptamers, nucleic acids, functionalized biological molecules, and combinations thereof.